Virtually all venoms in the families Elapidae ( cobras, coral snakes, tiger snakes ) and Hydrophiidae ( sea snakes ) have venom that paralyzes their prey. Most act on the respiratory drive first - killing their prey by suffocation.

I also know of a tarantula wasp that stings the tarantula without killing it but just paralyzes it permanently. Then it buries the tarantula and lays eggs with it. When the eggs hatch the little wasps eat the spider while it is still alive but paralyzed. Because the larve wasps need live food the wasp has adapted this type of venom. Pretty bad to be a tarantula I would say. But you asked about snake venom. I don't know of any snake that paralyzes any prey without the intent to kill it immediately.